graph TD
A[Region 1]
A --> B[Clinic 1]
A --> C[Clinic 2]
A --> D[Clinic 3]
B -.-> M1[Patient 1]
B -.-> N2[Patient 2]
B -.-> O3[Patient 3]
C -.-> P4[Patient 4]
C -.-> Q5[Patient 5]
C -.-> R6[Patient 6]
D -.-> S7[Patient 7]
D -.-> T8[Patient 8]
D -.-> U9[Patient 9]
classDef region fill:#f9f,stroke:#333,stroke-width:2px;
classDef clinic fill:#ccf,stroke:#333,stroke-width:2px;
classDef patient fill:#cff,stroke:#333,stroke-width:1px;
class A,E,I region;
class B,C,D,F,G,H,J,K,L clinic;
class M1,N2,O3,P4,Q5,R6,S7,T8,U9,V10,W11,X12,Y13,Z14,A15,B16,C17,D18,E19,F20,G21,H22,I23,J24,K25,L26,M27 patient;
linkStyle default stroke-width:4px;